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The Customers API is available to select partners during onboarding, and currently supports KYC of US individuals only. If you’re interested in using this product, get in touch and our team will follow up to discuss fit.
Not yet onboarded for Live? Try the Customers API in Sandbox. Live access is limited to onboarded partners; Sandbox is available to everyone.
Customer webhooks provide your app with real-time updates as Coinbase processes a customer’s KYC and compliance lifecycle. Subscribe your endpoint to react to capability changes and customer deletions without polling. Because verification and compliance reviews are asynchronous, webhooks are the recommended production pattern: a capability can stay pending briefly after all requirements are submitted, and ongoing monitoring can change a customer’s state at any time. See Capabilities and Requirements for the underlying lifecycle.

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Setup

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Prerequisites

Sign up at portal.cdp.coinbase.com, then navigate to API Keys and select Create API key under the Secret API Keys tab.
  1. Enter an API key nickname (restrictions are optional)
  2. Click Create
  3. Secure your API Key ID and Secret in a safe location
You’ll need an HTTPS URL to receive webhook events. For quick testing, webhook.site gives free temporary URLs instantly.For production, use your own HTTPS endpoint.
The CDP CLI handles authentication and exposes webhook subscription endpoints as typed commands (cdp data webhooks subscriptions create, list, update, delete). For raw HTTP, use cdp api.
npm install -g @coinbase/cdp-cli
cdp env live --key-file ./cdp_api_key.json
cdp data webhooks subscriptions list
Testing in Sandbox: Webhook subscriptions behave the same in Sandbox, so you can exercise the full flow without real customer data. Two adjustments to the prerequisites above:
  • A Secret API Key: create it in the Sandbox environment of the Portal rather than Live.
  • CDP CLI: configure a Sandbox environment pointed at the Sandbox platform base (/platform/v2) once, then run subscription commands against that environment.
# One-time: create a CLI environment named "sandbox" pointed at the Sandbox host
cdp env sandbox --key-file ./cdp-api-key.json --url https://sandbox.cdp.coinbase.com/platform/v2

cdp data webhooks subscriptions list
To generate test deliveries, change a customer’s capabilities with the sandbox magic SSN values — for example, the approve value activates the requested capabilities, and every capability status change emits customers.capability.changed. The Customers Quickstart walks a full sandbox flow that exercises these transitions.

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Event types

Subscribe to the customer event types relevant to your integration:
Event typeDescription
customers.capability.changedOne or more capability statuses changed for a customer. A single event can report several capabilities at once.
customers.customer.deletedThe customer record was deleted. This transition is terminal.

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Create a webhook subscription

Configuration notes:
  • target.url should be your HTTPS webhook endpoint that will receive the events.
  • You can set a headers object in target if your URL requires specific headers. Pass it inline with 'target.headers:={"custom-header":"value"}'.
  • Include every customer event type you want to receive so you do not miss a state change.
Create the webhook subscription with the CDP CLI: 
cdp data webhooks subscriptions create \
  'eventTypes:=["customers.capability.changed","customers.customer.deleted"]' \
  isEnabled:=true \
  target.url=https://your-webhook-url.com \
  target.method=POST
Sample webhook subscription response: 
201 Created
{
  "createdAt": "2026-06-23T22:31:26.157325Z",
  "eventTypes": [
    "customers.capability.changed",
    "customers.customer.deleted"
  ],
  "isEnabled": true,
  "labels": {
    "entity": "<YOUR_ENTITY_ID>"
  },
  "metadata": {
    "secret": "<SECRET_FOR_WEBHOOK_VERIFICATION>"
  },
  "secret": "<SECRET_FOR_WEBHOOK_VERIFICATION>",
  "subscriptionId": "<YOUR_SUBSCRIPTION_ID>",
  "target": {
    "url": "https://your-webhook-url.com"
  }
}

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Manage subscriptions

Use the subscriptionId from the response to view, update, or delete the subscription. List all subscriptions 
cdp data webhooks subscriptions list
View specified subscription details by subscription ID 
cdp data webhooks subscriptions get <SUBSCRIPTION_ID>
Update subscription update is a full replace. Pass every field, including ones you aren’t changing: 
cdp data webhooks subscriptions update <SUBSCRIPTION_ID> \
  'eventTypes:=["customers.capability.changed","customers.customer.deleted"]' \
  isEnabled:=true \
  target.url=https://your-new-webhook-url.com \
  target.method=POST
Delete subscription 
cdp data webhooks subscriptions delete <SUBSCRIPTION_ID>

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Webhook signature verification

Use the standard CDP webhook verification flow. The same code works for all webhook event domains. See Verify signatures for the full step-by-step implementation.

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Event payloads

Coinbase POSTs a JSON body containing only the event-specific fields. There is no outer envelope (eventId, eventType, timestamp, or data wrapper) in the request body. Routing and idempotency metadata arrive in HTTP headers instead:
HeaderDescription
X-Event-IdUnique identifier for this delivery. Use it for idempotency. The same event may be delivered more than once.
X-Event-TypeThe event type string (for example, customers.capability.changed).
X-Hook0-SignatureSignature for verifying the request. See Verify signatures.
Verify signatures against the raw request body bytes exactly as received. Parsing JSON before verification will break signature validation.
Example request
POST /webhook HTTP/1.1
Content-Type: application/json
X-Event-Id: 3a7f8b2e-1c4d-4e9a-b5f6-d8a2c0e7f194
X-Event-Type: customers.capability.changed
X-Hook0-Signature: t=1728394718,v0=9f8e7d6c5b4a...,h=content-type x-event-id x-event-type,v1=a1b2c3d4e5f6...

{ ... event payload JSON ... }

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customers.capability.changed

Emitted when the status of one or more capabilities changes. Each change is a distinct entry in the capabilities array. 
{
  "customerId": "customer_38d54acb-0868-431c-a88e-1ffcb62655eb",
  "capabilities": [
    { "code": "custodyFiat", "status": "active" },
    { "code": "transferFiat", "status": "active" }
  ]
}

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customers.customer.deleted

Emitted when the customer record is deleted. This transition is terminal. 
{
  "customerId": "customer_38d54acb-0868-431c-a88e-1ffcb62655eb"
}

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Best practices

To ensure reliable webhook delivery:
  • Test endpoints locally before enabling subscriptions in production.
  • Handle concurrent requests. Ensure your target URL can process multiple events simultaneously.
  • Process events asynchronously. Return a 200 response quickly and process the event in the background.
  • Use X-Event-Id for idempotency. The same event may be delivered more than once.
  • Monitor webhook receiver health. Track delivery success rates to your target URL.
  • Set up subscription monitoring. Use a scheduled job (for example, cron or a systemd timer) to periodically call the List Subscriptions API and verify critical subscriptions have isEnabled: true.
Subscriptions may be automatically disabled if your endpoint experiences sustained delivery failures (e.g., high failure rates, endpoint unavailability, or throughput issues). If this happens, fix the underlying endpoint issue and use the Update Subscription API to re-enable.